Tunable dual-channel ultra-narrowband Bragg grating filter on thin-film lithium niobate

Kamal Abdelsalam, Ehsan Ordouie, Milad G. Vazimali, Farzaneh A. Juneghani, Prem Kumar, Gregory S. Kanter, Sasan Fathpour*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


We demonstrate dual-channel phase-shifted Bragg grating filters in the telecom band on thin-film lithium niobate. These integrated tunable ultra-narrow linewidth filters are crucial components for optical communication and sensing systems, as well as future quantum-photonic applications. Thin-film lithium niobate is an emerging platform suitable for these applications and has been exploited in this Letter. The demonstrated device has an extinction ratio of 27 dB and two channels with close linewidths of about 19 pm (quality factor of 8×104), separated by 19 GHz. The central wavelength could be efficiently tuned using the high electro-optic effect in lithium niobate with a tuning factor of 3.83 pm/V. This demonstration can be extended to tunable filters with multiple channels, along with desired frequency separations and optimized tunability, which would be useful for a variety of complex photonic integrated circuits.

Original languageEnglish (US)
Pages (from-to)2730-2733
Number of pages4
JournalOptics Letters
Issue number11
StatePublished - Jun 1 2021

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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